Middlings-purifier



(No Model.) 3 Sheets-Sheet 1,

A. WOLF.

' MIDDLINGS PURIFIER.

No. 259,968. Patented ,JuneZO, 1882.

S. Pholo-Lilhognphen Washington. D4 0.

(No Model.) 3"Shee ts- -Sheet 2.

A. WOLF.

MIDDL'INGS PURIFIBR.

//////////All N. PETERS Phmum n m, Washinglnn. u. c.

UNITED STATES PATENT OFFI AUGUSTUS WOLF, OF ALLENTOWN, ASSIGNOR FONE-HALF. TO DAVID L. HAMAKEB, OFEAST HEMPFIELD, PENNSYLVANIA.

MlDDLINGS-PURIFIER.

To all whom it may concern:

Be it known that I, AUGUSTUS WOLF, a citizen of the United States,residing in Allentown, Pennsylvania, have invented certain Improvementsin Middlings-Purifiers, of which the following is a specification.

The objects of my invention are to readily control thefeedin g of themachine and to regulate the drafts of air through the same; and

these objects I attain in the manner which I will now proceed todescribe, reference being had to the accompanying drawings,in which-Figure 1, Sheet 1, is a side view of my improved middlings-purifier;Fig. 2, a sectional I5 plan on the line-1 2, Fig. 1; Fig. 3, Sheet 2, a

I longitudinal section of the machine on a larger scale than Fig. 1,-Figs. 4 and 5, transverse sections of Fig. 3 on the lines 3 4 and 5 6,respectively; and Fig. 6,a longitudinal section on the line 7 8, Fig. 5.

A is the outer casing of the machine, and B and D are two screen-framesarranged one above the other, each frame being supported at one end bylinks a, hung to the casing A, and at the other end by levers b, pivotedto the casing A at points between the screenframes, the upper frame, B,being attached to the upper arms of the levers and the lower frame, D,to the lower arms of said levers, as shown in Figs. 3 and-4, so thatwhen the lower frame is reciprocated in one direction the upper framewill be reciprocated in the opposite direction. This feature forms nopart of my present invention, however, as it is shown and described in aseparate application which I have made for a patent, said applicationhaving been filed May 19, 1881.

The lower screen-frame, D, is reciprocated by means of cranks on ashaft, E, adapted to bearings at one end of the machine, suitable rods,d, connecting the cranks to the frame. The shaft E also carries a rotaryfan, F, the tend-' ehcy of which is to withdraw the air through a pipeor passage, 0, from an air-box, M, arranged on the top of the casing Aand communicating with the interior of the latter through valvedopenings, in the manner hereinafter set forth.

The middlings are fed from a suitable hop- 50 per into a passage, 0, atthe top and one end SPECIFICATION forming part of Letters Patent No.259,968, dated June 20, 1882. Application filed March 13, 1882. (Nomodel.)

of the machine, and pass thence onto a pair of screens, 13, on the frameB, through openings the area of which is governed by an adjustable valveor plate, f, so that the quantity of middlings fed to the machine can bereadily and accurately regulated. The feeding is effected by transversebars G at the end of the- -frame B, and in order that these bars may bemadeof sufficient depth to properly act on the middlings without at thesame time presenting 6o too great a surface I notch the upper edge ofeach bar, as shown in Figs. 3 and 4.

The middlings, owing to the agitation of the screens B, are fed alongfrom the front to the rear endot' said screens, such particles as pass 65 .tion of a notched feed-bar, G, and are further screened, the meshesof the screen D being of varying degrees of fineness, as shown in Fig.3. Particles too large to pass through' the coarsest meshes of thescreen D are de- 80. 'livered from the front end of the screen into asuitable tailing-spout, those particles which pass through thescreenbeing collected in the trough h, and passing therefrom through valvedopenings into the box h in the usual manner. 8'5; The trough It hasgrated sides, for a purpose described hereinafter.

While the middlings are traversing the screens B and D, and passing fromone screen to the other, they are constantly subjected to 0 the actionof currents of air, which separate the light particles or fluff from theheavier particles, these currents being induced by the action of the fanF. The course of the currents is indicated by the arrows, and is asfollows: 5

. Air enters the casin g A through an opening, m, at the front end ofthe machine and traverses the troughs g beneath the screens B, passingup through the meshes of the screens and through the layers of middlingsthereon to I00 the space above the screens, from which it is drawn intothe air-box M through a valved opening, a, in the top of the casing A.

Currents of air are admitted to the trough h through the grated sides ofthe same, the air thus admitted passing up through the screen D andmiddlings thereon to the space above the screen, from which it passes tothe airbox M through a central vertical tube, M, located between thescreens B of the upper screenframe, B.

The opening sin the top of the casing A, which affords communicationbetween the airbox M and tube M, is provided with a valve, s, which hasnear each end a pivoted operating-rod, s, so that it can be adjusted toproperly control the area of the opening sin accordance with the desiredcharacter of the draft. For instance, when the valve is adjusted in aline directly across the opening, so as to partially obstruct thelatter, there will be a reduced draft throughout the entire length ofthe opening; but if the valve is adjusted at an angle to the opening, asshown by either of the dotted lines in Fig. 6, there will be a draftthrough one corner only of the opening 8. I am thus enabled to attain bymeans of a single valve the same effect as is at present reached by theuse of a series of independent valves, each controlling a portion onlyof the opening.

The tube M may in some cases be contracted in length, in which case thescreen B will extend continuously across the frame B at each end, thefeed-bar G will also be continuous, and a single collecting-trough, g,and spout y will replace the double spouts and troughs, the trough insuch case having a central passage, forming a continuation of the tubeM, as shown by dotted lines in Fig. 4.

I claim as my invention- 1. The combination of the outer frame or casingwith a screen-frame hung to the casing so as to be free toreciprocatetherein, and a trough-casing, h, secured to said reciprocating frame andhaving grated sides, whereby air is admitted to the trough directlybeneath the screen. as set forth.

2. The combination of the outer casing of the machine, the air-box M onthe top of the same, the upper 'screen-frame,witl1 air-passage therein,the lower screen-frame, and the tube M above the air-passage ot' theupper screen, whereby communication is afl'orded between the air-box andthe space between the upper and lower screens, as set forth.

3. The combination of the air-box M, the casing A, having a longitudinalopening, 8, and the valve 5, adjustable to any desired angle in respectto said opening 3, whereby the area of the latter is regulated and thedirection and force of the draft controlled, as set forth.

4. The combination of the upper screen having' trough-casing andaiepassage, the lower screen having trough-casing and air-inlet, thecasing A,having an inlet, m, valved transverse outlet n,- and valvedlongitudinal outlet 8, the air-box M, and the tube M above the upperscreen and in line with the air-passage therein and with the outlet 8,as set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

AUGUSTUS WOLF.

Witnesses:

HARRY DRURY, HARRY SMITH.

